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Let $P$ and $Q$ be constants. The graphs of the lines $x + 5y = 7$ and $15x + Py = Q$ are perpendicular and intersect at the point $(-8,3).$ Enter the ordered pair $(P,Q).$

 Jun 28, 2020
 #1
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HInt: If they are perpendicular, then their slopes are the negative reciprocrals of each other. 

 Jun 28, 2020

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